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Allis Chalmers C

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farmn4u

10-15-2007 17:02:49




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I bought a 194? allis chalmers C tractor not running. Rebuilt the carb. put new plugs and wires on it and had the magneto rebuilt... it fires but only runs for about one minute... cant figure out whats wrong with it.. serveral local guy looked at it and think its in the mag but it was just rebuilt.. it fires 1243 and the magneto doesnt point at one when its at one.. if you have any solutions i would like to now iam new to this allis thing so .. they are much more then a new diesel..

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ed in cny

10-23-2007 10:34:52




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 Re: Allis Chalmers C in reply to farmn4u, 10-15-2007 17:02:49  
I had a very similar thing going on with my B that I had bought. The last owner had done work on the engine. When I would crank it it would run but poorly sometimes it would even quit. After investigating the problem I found out that it fires on 3 not 1. It was 180 degrees out of time. I had to take off the front and turn the governor mag gear and reline up the timing. Back together it runs sweet. I did have a run in with rust in the gas but other than that it works well. Make sure that you are indeed firing on 1 and that the rotor also is on the one spot. If you take off the #1 plug and make sure that the compression stroke if coming up when everything should be lining up it's in time. Otherwise you may have the same problem i had. Good luck Keep us in formed

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Farmn4u

10-18-2007 09:14:05




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 Re: Allis Chalmers C in reply to farmn4u, 10-15-2007 17:02:49  
I also need to know the easiest way to split the tractor.. jack or how to make somekind of a contraption that will hold it up. I would have nerer thought a old tractor would be this hard its a good thing dad doesnt by just to farm with or we'd never get done..



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brian wilcox

11-01-2007 09:51:35




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 Re: Allis Chalmers C in reply to Farmn4u, 10-18-2007 09:14:05  
Believe it or not . I used my engine hoist /ran a chain to the vaulve cover bolts / but a tall jack stand under trans . It worked great . They make a carb plate for cars and thay pull the engine by using the the intake carb bolts .



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steve(ill)

10-16-2007 18:56:06




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 Re: Allis Chalmers C in reply to farmn4u, 10-15-2007 17:02:49  
is that 1243 running clockwise starting at the top inner wire on the mag? some guys have switched two wires before.--- if it does run o.k., then quits, pull the hose to carbuetor and let it run in a bucket for 2 minutes and see if it is constant flow. might be screen on the bowl or crap in the fuel tank.



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Farmn4u

10-18-2007 08:59:20




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 Re: Allis Chalmers C in reply to steve(ill), 10-16-2007 18:56:06  
I had someone who is fluent with Allis look at it the other day and the said it my be the main bearing. he said it was way to hard to crank over. Ive done everything you can think about to the gas and the line.. The tractor has been timed and the mag is in fine shape.. Is it hard to repair the main beering.. Iam also going to have the heads redone..



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Clay in MI

10-15-2007 17:29:10




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 Re: Allis Chalmers C in reply to farmn4u, 10-15-2007 17:02:49  
If it runs smoothly for a minute and then quits I'd guess its a fuel issue. Clogged tank/line/carb. If it is missing when it runs for a minute it might be a timing problem. They'll run quite well sometimes on two cylinders! Check out Rod (NH) page on mag timing.

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